Augmented glenoid components and devices for implanting the same

Abstract

A glenoid component for coupling to a scapula of a subject includes a body. The body includes an articulation surface adapted to articulate with a humeral component, and the body further includes a distal surface adapted to face the glenoid of the scapula. The distal surface includes a base surface portion adapted to face a first portion of the glenoid. The distal surface further includes an augmented surface portion adapted to face a second portion of the glenoid. The base surface portion and the augmented surface portion define an obtuse angle therebetween.

What is claimed is: 
     
       1. A device for removing bone from a glenoid of a subject, the device comprising:
 a handle adapted to be manipulated by a user; 
 a reaming head comprising a base and a reaming portion, the reaming portion comprising a proximal surface and a distal surface, the base extending proximally of at least a portion of the proximal surface of the reaming portion, the distal surface comprising at least one reaming edge adapted to engage and shape the glenoid; and 
 a bearing connecting the reaming head to the handle, the bearing comprising a proximal portion and a distal portion, the proximal portion extending at an angle relative to a longitudinal axis extending through the distal portion of the bearing; 
 a drive shaft rotatably supported by and extending through the bearing and having a distal end disposed within the reaming head, the drive shaft being rotatable about a drive shaft axis at the distal end, wherein 
 the reaming head is adapted to be rotatably driven about a reaming axis by the drive shaft, the reaming axis being non-parallel to the drive shaft axis at the distal end. 
 
     
     
       2. The device of  claim 1 , wherein when the drive shaft rotates the reaming head and the reaming head engages the glenoid, the reaming head reams the glenoid asymmetrically relative to the drive shaft axis. 
     
     
       3. The device of  claim 1 , wherein the drive shaft is straight. 
     
     
       4. The device of  claim 1 , further comprising a pivot coupling disposed laterally between the reaming head and the distal end of the drive shaft. 
     
     
       5. The device of  claim 1 , wherein an intersection of the reaming axis and the drive shaft axis is disposed within the reaming head. 
     
     
       6. The device of  claim 1 , wherein an angle between the reaming axis and the drive shaft axis is selectively adjustable. 
     
     
       7. The device of  claim 6 , wherein the bearing is rotatable to adjust the angle between the reaming axis and the drive shaft axis. 
     
     
       8. The device of  claim 1 , wherein the reaming head is configured to engage the glenoid to form a concave surface on the glenoid. 
     
     
       9. The device of  claim 8 , wherein the reaming head is configured to engage an anterior portion, a supero-anterior portion, or an infero-anterior portion of the glenoid to form the concave surface. 
     
     
       10. The device of  claim 8 , wherein the reaming axis is configured to be adjusted over a range of angles, said range of angles including a 15 degree angle relative to the drive shaft axis to form the first concave surface. 
     
     
       11. The device of  claim 8 , wherein the concave surface is a first concave surface and the reaming head is configured to engage the glenoid to form a second concave surface on the glenoid. 
     
     
       12. The device of  claim 11 , wherein the reaming head is configured to engage a posterior portion, a supero-posterior portion, or an infero-posterior portion of the glenoid to form the second concave surface. 
     
     
       13. The device of  claim 11 , wherein the reaming axis is configured to be adjusted over a range of angles, said range of angles including a 35 degree angle relative to the drive shaft axis to form the second concave surface. 
     
     
       14. The device of  claim 1 , wherein the reaming head further comprises an aperture extending through the distal surface. 
     
     
       15. The device of  claim 14 , wherein the reaming head comprises arcuate arrays of reaming elements extending from the aperture to a periphery of the distal surface. 
     
     
       16. The device of  claim 1 , wherein the proximal portion of the bearing comprises a plurality of notches. 
     
     
       17. The device of  claim 1 , wherein an intersection of the reaming axis and the drive shaft axis is not disposed proximal of the reaming head. 
     
     
       18. The device of  claim 1 , wherein the distal portion of the bearing is at least partially disposed within the reaming head. 
     
     
       19. A device to remove bone from a glenoid of a subject, the device comprising:
 a handle adapted to be manipulated by a user; 
 a reaming head including a base and a plurality of reaming elements, each of the reaming elements supported by the base and curving outwardly while radiating from the base and including a distal reaming surface; 
 a drive shaft including a distal end coupled with the reaming head, the drive shaft rotatable about a drive shaft axis; and 
 a rotatable driver coupler disposed radially between the distal end of the drive shaft and the reaming head, the distal end of the drive shaft extending through the rotatable driver coupler, the rotatable driver coupler configured to facilitate rotation of the drive shaft and the reaming head such that the drive shaft axis and a reaming axis are non-parallel, the reaming axis being an axis in which the reaming head rotates to remove the bone. 
 
     
     
       20. The device of  claim 19 , wherein each reaming surface of the plurality of reaming elements defines a concave surface of the bone. 
     
     
       21. The device of  claim 19 , further comprising a guard member having a distal portion and a proximal portion, the guard member configured to inhibit a portion of the reaming surface from engaging bone. 
     
     
       22. The device of  claim 21 , wherein the guard member is generally C-shaped. 
     
     
       23. The device of  claim 21 , wherein the distal portion of the guard member is configured to be detachably mounted to a guide post. 
     
     
       24. The device of  claim 21 , further comprising a guide post extending distally from the guard member. 
     
     
       25. The device of  claim 24 , wherein the guide post is detachably mounted to the guard member via a threaded hole. 
     
     
       26. The device of  claim 19 , wherein the rotatable driver coupler is a separate component from the reaming head. 
     
     
       27. The device of  claim 19 , wherein an intersection of a reaming axis of the reaming head and the drive shaft axis is disposed within the reaming head. 
     
     
       28. The device of  claim 19 , wherein the rotatable driver coupler includes a generally sphere-shaped element at the distal end of the drive shaft. 
     
     
       29. The device of  claim 19 , wherein an angle between the reaming axis and the drive shaft axis is selectively adjustable. 
     
     
       30. The device of  claim 29 , further comprising a bearing connecting the reaming head to the handle and the bearing is rotatable to adjust the angle between the reaming axis and the drive shaft axis.